Hydraulic System Flashcards
What is the Normal hydraulic system pressure
3000 PSI
What is the maximum hydraulic system pressure
3000 +- 200 PSI
When is the blue hydraulic system pressurized
Automatic with the first engine start
What is the status of the yellow hydraulic system in the graphic below
The ENG PUMP switch is ON and the output pressure is low
IF the ENG 2 FIRE switch is released out
The PTU pressurizes the yellow system
Which hydraulic system pumps are running after the #1 engine start
Green and Blue
When is the PTU inhibited
NW STRG DISC message displayed and one engine master switch ON
What is the purpose of the PTU
Enables the green system to pressurize the yellow system and vice versa
The PTU is automatically activated when there is a _____ PSI differential between the _____ and _____ hydraulic systems
500, green, yellow
After cargo door operation, how long is the PTU inhibited
40 seconds
What does the amber PTU indication mean
The PTU is switched off
In flight a PTU FAULT light, in addition to an ENG 1 or ENG 2 FAULT light, could indicate a
Yellow hydraulic reservoir low fluid level
In flight, in addition to the PTU FAULT light, what other FAULT light will illuminate for a green or yellow system reservoir problem
ENG 1 or 2 PUMP FAULT light
Which device shuts off hydraulic power to the heavy users if system pressure drops below a predetermined value
Priority Valves
The RAT pressurizes the blue hydraulic system to
2500 PSI
